Tag Archives: types

New Costa Rican euconulids

Just published: a paper by Barrientos with new data on Costa Rican Euconulidae. The abstract is as follows:

Introduction: The family Euconulidae is circumglobal, but only one subfamily, the Euconulinae, occurs in the American continent. Fourteen native euconulids, in three genera, have been reported from Costa Rica.
Objective: In this paper I describe Tikoconus, a new genus of Euconulinae endemic to Costa Rica.
Methods: I dissected alcohol-preserved euconulids collected in Costa Rica. I took photographs or electron micrographs or drew the shell, external anatomy, reproductive system, mantle cavity organs and radula.
Results: The genus Tikoconus can be recognized by its semislug appearance and very thin and often flexible subglobose to subglobose-depressed external shell. Other distinctive features of the genus are a lack of black dots on the mantle and the presence of at least some dark blotches on the subpedal groove band. Internally, the urethra has a Z-shaped prolongation that almost reaches the mantle collar. The reproductive system has a distinctive external C-shaped penial gland that surrounds half of the penis circumference and is attached to the penis and to the penial caecum, but not connected to them by ducts. Also, there is an internal mono- or bi-lobulated extension in the penis. The epiphallus has a verge that enters into the penis. The penial sheath surrounds part of the penis, the epiphallus base and the penial retractor muscle insertion, but leaves the penial gland and the penis caecum free. The gametolytic gland is absent. I described two new subgenera: Tikoconus with six new species-T. (T.) costaricanus sp.n. (type species), T. (T.) onca sp.n., T. (T.) andresi sp.n., T. (T.) katyae sp.n., T. (T.) alosii sp.n., T. (T.) subsilvanus sp.n.; and Bribriconus with only one species-T. (B.) thompsoni sp.n. All species have restricted distributions and are endemic to particular watersheds, except for T. costaricanus which occurs nearly throughout the central mountains of Costa Rican. This genus inhabits very wet, little disturbed tropical forests from 400 to 2 500 masl on the Atlantic slope and from 760 to 2 500 masl on the Pacific slope. The genus Velifera, the other semislug euconulid reported from Costa Rica, is kept as a valid taxon and I choose the specimen ANSP 48765 as lectotype of Velifera gabbi with the purpose of clarifying the application of the name to a taxon.
Conclusion: A new euconulid genus and seven species were described.

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This is thorough paper on this less-known family which occurs in different Neotropical countries. A key is included for the species of the new genus. The paper provides interesting data on the anatomy and ecology of these species, data which are hardly known for other representatives of this family in the Neotropics.

Reference:
Barrientos, Z., 2019. A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae). Revista de Biologia Tropical, 67 (6): 1313-1358.

A new subulinid from Argentina

A paper that escaped my attention until now, is by Miquel & Jaime (2018) describing a new species from Argentina. “The presence of two Subulinidae living in the tropical region of Argentina is recorded: Nannobeliscus mariaisabelae spec. nov. and an indeterminated species of Leptinaria. N. mariaisabelae is characterized by turrited shell, radular formula 17+1+17 with tricuspid teeth, penis with verge and epiphallus (producing spermatophores); vagina long, with one medial bulb; ovoviviparous. Leptinaria spec. is known only for its small shell, conical, perforated, with strong axial ribs, columella not truncated, amber-yellowish“.

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Based on anatomical data the authors argue that Nannobeliscus deserves to be raised to generic status. The genus is thus known from Argentina and Central Peru (where is was described from by Weyrauch), but undoubtedly more taxa in intermediate regions may be grouped with it.
Reference:
Miquel, S.E. & Jaime, G.L., 2018. Subulinidae species from northern Argentina with description of a new species of Nannobeliscus Weyrauch (Gastropoda, Stylommatophora, Achatinoidea). Spixiana, 41: 1–7.

New fossils from Argentina

Just published: a paper by Miquel on continental gastropods from Argentina. “A new genus and two new fossil species of continental gastropods from the upper part of the Irene Formation—which is probably Huayquerian–Montehermosian (early Pliocene) and is exposed in the Quequén Salado River (Buenos Aires Province, Argentina)—are described: the new genus and species of freshwater gastropod Argentisioliella pardignasi (Cochliopidae) and a new species of landsnail of the family Bulimulidae (Bocourtia (Kuschelenia?) bonariensis). Argentisioliella pardignasi is morphologically related to those described for the Pebas Formation of Pliocene age. The specimens have bulloid morphology, long and narrow aperture, with a channeled peristome and two folds in the columellar wall. This is the first description of similar snails of the Pebas and Irene formations. Bocourtia (Kuschelenia?) bonariensis is the most ancient record for the genus, being recorded far away from the area of its current distribution (northwest Argentina). The specimen is an internal cast, with more than three convex whorls and a large aperture. Its distribution would coincide with the final phase of the Mio–Pliocene climatic change, when numerous terrestrial gastropods of Patagonian and Pampean provenance disappeared. A well-conserved specimen of the terrestrial snail Austroborus (Strophocheilidae Pilsbry), showing an almost complete shell, with more than 4.5 convex whorls, last whorl and large aperture, was also recorded. In the study area, this genus was present during the Pleistocene and Holocene, living in restricted areas of Argentina and Uruguay, with a disjunctive and relictual distribution“.

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Always interesting to see how palaeontologists are able to read those fragments. In this case the connection between Central Argentina and Pebas, in northeastern Peru on the Amazonian side, is remarkable. Thus a short but interesting paper.

Reference:
Miquel, S.E., 2019. A new genus and two new species of fossil continental gastropods from the early Pliocene of Argentina (Mollusca). – Ameghiniana 56 (2): 187–194.

Galápagos Gastrocopta

A recent paper by Miquel & Brito focusses on Gastrocopta species from the Galápagos, already mentioned in a previous paper.
Their abstract is as follows “A revision of Gastrocopta from the Galápagos Islands (Ecuador) is made. Four new species from Pinzón, Santa Cruz and Floreana Islands are described; species previously known are redescribed and new locations are added. Gastrocopta (Gastrocopta) reibischi is revalidated through new records from Floreana, Isabela and San Bartolomé Islands. Shell shape and the number, morphology and disposition of the apertural barriers support the discrimination of the taxa. The species have cylindrical to pupoid shells; the number of apertural barriers –differentiated as lamellae, folds and nodulae – varies between 4 and 11, almost completely occluding the aperture in the more complex cases. These structures are: angular-parietal, infraparietal, supracolumellar, columellar, subcolumellar lamellae, and supernumerary, basal, infrapalatal, lower-palatal, interpalatal, upper-palatal and suprapalatal folds. In addition to this classic scheme, a supernumerary fold and a nodule are added. Calcareous concretions –pustulae – are found in several species, mainly located in the peristome. The aulacognathous jaw and radular dentition formulae of Gastrocopta (Gastrocopta) clausa and Gastrocopta (Gastrocopta) munita, are described and photographed for the first time“.

The new species are all belonging to the nominate subgenus, and have been named respectively G. (G.) aliciae, G. (G.) christinae, G. (G.) franki, and G. (G.) herrerai. This means that the number of Gastrocoptid species from this archipelago has doubled! As most research on this group so far has been limited to a few islands, further novelties are to be expected as a result of future work.

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Reference:
Miquel, S.E. & Brito, F.F., 2019. Taxonomy and distribution of species of Gastrocopta Wollaston 1878 (Mollusca: Gastropoda: Gastrocoptidae) from the Galápagos Islands (Ecuador). – Molluscan Research, 39: 265-279.

A new Peruvian Sultana

Just published: a new Peruvian species of Sultana, published by two Spanish authors, Ahuir and Torres.
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The species is described from northern Peru, Dept. Piura, near Huancabamba on the border with Ecuador. Unfortunately the picture given is quite dark, but it shows the characteristic pink lip and the white inside of the aperture well enough. The holotype will be deposited in the Paris museum.
Thanks to Philippe Bouchet who sent me the paper.

Reference:
Ahuir Galindo, J. & Torres Alba, J.S., 2019. One new terrestrial gastropod species from Peru. – Malacologia Mostra Mondiale, 104: 3-4.

New Cuban species

A while ago (December 2017) Espinosa et al. published a paper which only now surfaced. Its abstract is extremely short, even not mentioning the names of the new species they described. “A commented and illustrated catalog of 37 land an freshwater mollusks species from Cupeyal del Norte, Alejandro de Humboldt National Park, Guantánamo, Cuba, is presented, 18 of them are new records to the park and 8 are described as new species, and data’s about others land mollusks species of the Park are included”.

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The new taxa introduced are:

[Helicinidae:] Emoda poeyana

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[Annulariidae:] Diplopoma (Subannularia) mucaralense

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Annularisca (Annularella) haylerae

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[Urocoptidae:] Arangia humboldtiana

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Carcinostemma silvai

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[Achatinidae:] Obeliscus (Stenogyra) diegoi

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[Cepolidae:] Coryda thierryi

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Coryda carabelloi

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Reference:
Espinosa J., Herrera-Uría J. & Ortea J., 2017. Moluscos terrestres y fluviales del Sector Cupeyal del Norte, Parque Nacional Alejandro de Humboldt, Guantánamo, Cuba, con la descripción de nuevas especies. – Revista de la Academia Canaria de Ciencias, 29: 61-110.

Land snail holotypes in the IES, Havana

More and more institutions are making their holdings of type material available, either through publications or on the web. This is very useful as it greatly helps researchers to find the original material which may be needed for comparison.

Hernández Q. et al. have recently made an addition. “We present the first list of holotypes of terrestrial molluscs housed in the collection of the Institute of Ecology and Systematics, Cuba. The majority of holotype specimens come from collections belonging to Miguel L. Jaume, Oscar L. Alcalde, Alfredo de la Torre and Raúl P. Guitar. The type material of the collection has 66 taxa including species and subspecies. The genera represented in this type collection are Liguus, Farcimen, Cerion, Cryptelasmus, Idiostemma, Cubadamsiella and Opisthosiphon”.

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Although it is unfortunate that no pictures of these holotypes are included, which would eliminate the need for (possibly difficult) inquiries, the listing may be applauded as a first step.

Reference:
Hernández Q., M, et al., 2018. Catalogue of holotypes of terrestrial molluscs (Mollusca, Gastropoda) of the Institute of Ecology and Systematics, Havana, Cuba. – Poeyana, 507: 44-49.