Radomaniola pesici, Delicado & Hauffe, 2022

Delicado, Diana & Hauffe, Torsten, 2022, Shell features and anatomy of the springsnail genus Radomaniola (Caenogastropoda: Hydrobiidae) show a different pace and mode of evolution over five million years, Zoological Journal of the Linnean Society 196, pp. 393-441 : 423-425

publication ID

https://doi.org/ 10.1093/zoolinnean/zlab121

publication LSID

lsid:zoobank.org:pub:89452E3C-3AFE-449C-93C6-24EEE19AE45D

DOI

https://doi.org/10.5281/zenodo.7036887

persistent identifier

https://treatment.plazi.org/id/42A9C1DA-B6A9-40BE-9A96-4F381D133CA2

taxon LSID

lsid:zoobank.org:act:42A9C1DA-B6A9-40BE-9A96-4F381D133CA2

treatment provided by

Plazi

scientific name

Radomaniola pesici
status

sp. nov.

RADOMANIOLA PESICI View in CoL SP. NOV.

( FIGS 18 View Figure 18 , 19 View Figure 19 )

Z o o b a n k r e g i s t r a t i o n: z o o b a n k. o r g: a c t: 42A9C1DA-B6A9-40BE-9A96-4F381D133CA2

Etymology: Named after Professor Vladimir PeŠić, collector of this species, in recognition of his valuable contribution to the knowledge of the fauna of Montenegro.

Type material: Holotype ( MNCN 15.05 About MNCN /200163), five paratypes ( MNCN 15.05 About MNCN /200164) in the MNCN collection and ~ 20 paratypes ( UGSB 19048 ) in the

UGSB collection. Type locality: Bar Spring , Donje Vrelo, Montenegro .

M a t e r i a l s t u d i e d: B a r S p r i n g, D o n j e V r e l o, Montenegro, 42.86°N, 20.25°E GoogleMaps , V.P., May 2005 , MNCN 15.05 About MNCN /200164 and UGSB 19048 (80% ethanol) .

Diagnosis: Protoconch microsculpture wrinkled; central radular tooth formula 7-C-7/1-1; bursa copulatrix globular, with a long duct; SR1 elongate, duct short; SR2 slightly shorter than SR1, elongate, duct short; penis unpigmented, gradually tapering, base narrow, approximately as long as head length; nervous system weakly pigmented, moderately concentrated (mean RPG ratio = 0.47).

Description: Shell ovate-conic, 3.5–4.0 whorls, height 1.75–2.25 mm ( Fig. 18A–D View Figure 18 ; Supporting Information, Table S6). Periostracum whitish. Protoconch ~400 µm wide, 1.5 whorls; nucleus ~150 µm wide; protoconch microsculpture pitted ( Fig. 18G View Figure 18 ). Teleoconch whorls convex, with deep sutures; body whorl large, occupying about three-quarters of total shell length. Aperture slightly oval; inner lip thicker than outer lip; peristome margin simple, straight ( Fig. 18B View Figure 18 ). Umbilicus narrow, not covered by the inner lip. Operculum oval, brownish, about two whorls; muscle attachment area oval and located near the nucleus ( Fig. 18E, F View Figure 18 ). Radular length intermediate, ~600 µm (~25% of total shell length), with ~60 rows of teeth ( Fig. 18H View Figure 18 ). Central tooth formula 7-C-7/1-1 ( Fig. 18I View Figure 18 ); basal tongue U-shaped, length about equal to lateral margin. Lateral tooth formula 4-C-4. Inner marginal teeth having 30–32 tapered cusps, shortening toward the base. Outer marginal teeth with 30–35 sharp cusps ( Fig. 18J View Figure 18 ).

Animal darkly pigmented except for neck and tentacles ( Fig. 19F View Figure 19 ). Ctenidium with ten or 11 welldeveloped gill filaments, occupying ~50% of pallial cavity length and positioned posteriorly. Osphradium of intermediate width and opposite middle of ctenidium ( Fig. 19A View Figure 19 ). Stomach as long as wide, with two chambers almost equal in size; style sac longer than wide, surrounded by an unpigmented intestine ( Fig. 19B View Figure 19 ; Supporting Information, Table S7). Nervous system slightly pigmented, moderately concentrated (mean RPG ratio= 0.47); cerebral ganglia approximately equal in size, presenting small black granules ( Fig. 19C View Figure 19 ).

Female glandular oviduct approximately two times longer than wide. Albumen gland shorter than capsule gland. Bursa copulatrix globular, slightly longer than wide. Bursal duct longer than bursal length. Renal oviduct unpigmented, coiled. SR1 elongate, duct short, joining renal oviduct slightly above the insertion point with bursal duct. SR2 slightly shorter than SR1, elongate, with a short duct, located on renal oviduct near loop ( Fig. 19D, E View Figure 19 ; Supporting Information, Table S8).

Male genitalia with a prostate gland approximately two times longer than wide, bean shaped; seminal duct entering the middle-posterior region; pallial vas deferens emerging close to its anterior edge ( Fig. 19H View Figure 19 ). Penis unpigmented, gradually tapering, approximately as long as head length, base narrow, weakly folded along inner edge and with one medial outgrowth on its left side ( Fig. 19F, G View Figure 19 ; Supporting Information, Table S9); penis attached well behind the right eye; penial duct narrow, near outer edge, almost straight.

Remarks: This species resembles R. montana and R. filiola in bearing a more ovate shell than other congeners. Anatomically, R. pesici differs from the two species according to its larger bursa copulatrix, more slender penis, longer radula and larger central radular teeth. Average sequence divergence among the three species ranges between 5.3 and 7.9% for COI. Radomaniola pesici is also differentiated from the geographically proximate R. curta and R. wolffi in its shorter and more ovate shell, a larger number of cusps on the central and lateral teeth, smaller bursa copulatrix with a shorter duct, shorter penis and an average sequence divergence of 4.5–6.2% for COI (Supporting Information, Table S4).

MNCN

Museo Nacional de Ciencias Naturales

V

Royal British Columbia Museum - Herbarium

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