Tag Archives: bulimulidae

New records from Baja California

Baja California is an area with a rather scarce land snail fauna, and limited focussed papers in literature. Clark & Salisbury (2016) report on a small collection made during a biodiversity survey inside the Sierra La Laguna Biosphere Reserve, where a new gold mine is being planned.

The snails reported are already known from other localities on the penisula, viz. Naesiotus rimatus (Pfeiffer, 1847), N. spirifer (Gabb, 1868), and Rabdotus sufflatus (Gould in Binney, 1859). A new record is a as yet unidentified Succinea species, which was only collected as dead shell material.

Reference:
Clark, W.H. & Salisbury, R., 2016. New land snail records for Baja California Sur, Mexico. –Conchylia, 47 (3-4): 59-64.

 

Venezuelan land snails

The following report was found on Facebook, with land snails data from NE Venezuela, a region for which hardly reliable data exist in literature.

 

foto van Ignacio Agudo.
foto van Ignacio Agudo.
foto van Ignacio Agudo.

Ignacio Agudo aan Moluscos del Caribe/ Moluscos do Caribe/ Caribbean Mollusks

… NEW UPDATING DATA ( III ) — ABOUT RECENT AND SUB-FOSSIL CONTINENTAL SNAILS (MOLLUSCA: GASTROPODA: CAENOGASTROPODA & PULMONATA) OF ARAYA PARISH, SUCRE STATE, NORTHEASTERN VENEZUELA, SOUTHERN CARIBBEAN REGION: A “PRELIMINARY” FIELD BALANCE !

Total of seventeen (17) verified species (thirteen (13) terrestrial — two (2) non-native/ exotic — and four (4) freshwater forms — one non-native/ exotic), found in “xerophytic environments” of the parish until “December 2016”, distributed in fourteen (14) genus and nine (9) families.

Important to highlight that, in addition to the three (3) other specifically native aquatic/ limnic forms, all the thirteen (13) native terrestrial species so far detected in the region “contradictorily” correspond to own forms of environments/ humid forest ecosystems ……….

_@/”
SYSTEMATIC RELATIONSHIP:

– Family HELICINIDAE Férussac, 1822
Helicina tamsiana (Pfeiffer, 1850)

– Family NEOCYCLOTIDAE Kobelt & Möllendorff, 1897
Poteria fasciatum (Kobelt & Schwanheim, 1912)

– Family AMPULLARIIDAE Gray, 1824
Pomacea glauca (Linnaeus, 1758)
Marisa cornuarietis (Linnaeus, 1758)

– Family LYMNAEIDAE Rafinesque, 1815
Pseudosuccinea columella (Say, 1817)

– Family PLANORBIDAE Rafinesque, 1815
Drepanotrema lucidum (Pfeiffer, 1839)

– Family ORTHALICIDAE Albers, 1860
Bulimulus cacticolus (Reeve, 1849)
Bulimulus constrictus Pfeiffer, 1841)
Bulimulus krebsianus Pilsbry, 1897
Drymaeus multilineatus (Say, 1825)
Oxystyla abducta (Shuttleworth, 1856)
Oxystyla maracaibensis (Pfeiffer, 1899)
Plekocheilus (Eudolichotis) distortus (Bruguière, 1789)

– Family ODONTOSTOMIDAE Pilsbry & Vanatta, 1898
Biotocus (- Tomigerus) cumingi (Pfeiffer, 1849) [according to Simone, 2006: Biotocus cumingi]

– Family SUBULINIDAE Fischer & Crosse, 1877
Beckianum beckianum (Pfeiffer, 1846)
Subulina octona (Bruguière, 1798)

– Family ACHATINIDAE Swainson, 1840
Achatina (Lissachatina) fulica (Bowdich, 1822)


The adjective ‘native’ which is used here, should be considered with care. E.g., the Subulinid and Achatinid species have been introduced, and also Drymaeus multilineatus has probably been introduced in the past. The list contains thus several species which originate from elsewhere, which is no big surprise as the locality is at the coast.

Apart from some minor errors (Bulimulus and Drymaeus belong to the family Bulimulidae; Oxystyla should be Orthalicus, abducta = obductus), this is information from a country with comparably hardly good information in the malacological literature.

A new fossil Radiodiscus

Papers on Neotropical fossils are rare, but Sergio Miquel is a regular contributor of them. Although Turazzini & Miquel (2014) was overlooked by me, I mention the paper now it came to my attention. The abstract follows after the break.

schermafbeelding-2016-10-26-om-07-12-50

“Numerous fossil gastropods have been recorded in an edaphic level of the middle section of the the Aisol Formation (Mendoza Province, Argentina). This stratigraphic section bears an association of fossil mammals suggesting an early Pliocene age (possible Montehermosan SALMA). Up to four taxa of gastropods have been identified, belonging in Succinea Draparnaud (Succineidae), Gastrocopta Wollaston (Vertiginidae), Bostryx Troschel (Bulimulidae), and a new species of Radiodiscus Pilsbry and Ferriss (Charopidae). The fossil record of terrestrial pulmonate mollusks in Argentina is scarce and mainly restricted to the Quaternary. Thus, the record of these taxa is of paramount importance because it constitutes the oldest record of Gastrocopta and Succinea in Argentina, the first record of Bostryx in Mendoza Province, and the first record of the family Charopidae (Radiodiscus sanrafaelensis nov. sp.) in Pliocene deposits of Argentina”.

Reference:
Turazzini, G.F. & Miquel, S.E., 2014. A terrestrial gastropod community from the Early Pliocene (Neogene) of Mendoza, Argentina, with description of a new species of Radiodiscus Pilsbry and Ferriss, 1906 (Mollusca: Pulmonata: Charopidae). – Ameghiniana, 51(5): 396-404.

New paper

In the latest issue of the Journal of Conchology a paper appeared by Araya et al. about the occurrence of Bostryx hennahi (J.E. Gray, 1828) in northern most Chile and southernmost Peru.

schermafbeelding-2016-09-07-om-08-17-07

This species appears confined to fog oasis in the extreme arid deserts in the region, and is thus an example of a harnessed species to harsh conditions.

Reference:
Araya, J.F., Madrid, M. & Breure, A.S.H., 2016. Bostryx hennahi (Gray, 1828) the largest Chilean bulimulid (Mollusca: Pulmonata) rediscovered among Tillandsia communities in northern Chile. — Journal of Conchology 42: 161–165.

Reviving Galapagos snails

Under this short title as eye-catcher, Villanea et al. (2016) recently published about an improved method to apply ancient-DNA techniques to identify material obtained from empty shells. The full abstract reads as follows: “Snail shells represent an abundant source of information about the organisms that build them, which is particularly vital and relevant for species that are locally or globally extinct. Access to genetic information from snail shells can be valuable, yet previous protocols for extraction of DNA from empty shells have met with extremely low success rates, particularly from shells weathered from long-term exposure to environmental conditions. Here we present two simple protocols for the extraction and amplification of DNA from empty land snail shells from specimens of Galápagos endemic snails, including presumably extinct species. We processed 35 shells of the genus Naesiotus (Bulimulidae) from the Galápagos islands, some from species that have not been observed alive in the past 50 years. We amplified and sequenced short fragments (≤244 bp) of mitochondrial DNA (mtDNA) from 18 specimens. Our results indicate that the implementation of an ancient DNA extraction protocol and careful primer design to target short DNA fragments can result in successful recovery of mtDNA data from such specimens”. The crux is that the method seems to circumvent largely the PCR inhibitors that are co-extracted when using degraded shells. The resulting tree is given below.

Villanea16

One of the co-authors wrote me “We are really excited about this approach as it will allow us to include rare and potentially extinct species to our considerations of the evolutionary history of the Naesiotus group”. Methodical seems the approach sound, although it remains vague what exactly the inhibitors are. Given the more laborious extractions during aDNA work, it seems to me that the PCR will remain the bottle-neck. With more PCRs needed, this will remain a relatively costly procedure.

Reference:
Villanea, F.A., Parent, C.E. & Kemp, B.M., 2016. Reviving Galapagos snails: ancient DNA extraction and amplification from shells of probably extinct Galapagos endemic land snails. – Journal of Molluscan Studies (early online access; doi: 10.1093/mollus/eyw011).

New Brazilian species (2)

The second paper is describing a new species from western Bahia State, with an emended description of the recently described genus Kora, with a revision of species ascribed to it.

“A new species of land snail was recently found in the municipalities of Carinhanha, Serra do Ramalho and Coribe, western Bahia state, Brazil. It is described herein as Kora rupestris n. sp. and can be easily recognized from its congeners by its usually narrower shell and aperture, and especially by its protoconch sculpture pattern. In light of this new discovery, new emended diagnosis and description are provided for the genus Kora, and two taxa previously described under this genus are excluded, being transferred to the genus Drymaeus [D. iracema (Simone, 2015) n. comb. and D. terreus (Simone, 2015) n. comb.]. The region where the new species was found consists of a contact zone of the Caatinga and Cerrado biomes. Such regions are proving to be quite diverse and a more thorough knowledge of their fauna is of utmost importance for future conservation efforts”.

R&S_K

As a consequence of the availability of more material, Kora is now transferred from the family Orthalicidae to the family Bulimulidae.

This paper too was available on the net before the official publication date.

Reference
Salvador, R.B. & Simone, L.R.L., 2016. A new species of Kora from Bahia, Brazil (Gastropoda: Pulmonata: Orthalicoidea), with an emended diagnosis of the genus. – Stuttgart Beiträge zur Naturkunde A, Neue Serie 9: 1–7.