Shadinia terpoghassiani Shadin 1952
Creators: name: Diana Delicado
name: ladimir Pešić
name: Peter Glöer
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy

description: Shadinia terpoghassiani (Shadin, 1952)   
Figs 8–9; Tables 2–3  
 Pyrgula terpoghassiani Shadin, 1952: 227   
 Pyrgula terpoghassiani – Akramowski 1952, nom. nud.   New diagnosis  
Shell ovate-conic, yellowish, with two weak parallel keels along the body whorl; pyriform aperture; protoconch microsculpture wrinkled; central radular tooth formula 3–C–3/(2)3–3(2); pyriform bursa copulatrix; SRI elongate with a short duct and SRII smaller, globular and without duct; penis gradually tapering and simple, with a distal end tapered and black pigmented; nervous system moderately concentrated (mean RPG ratio = 0.45) and with slight black pigmentation.  Material examined  
Type material not specified.  Type locality  
ARMENIA: Lake Aiger-Lich, south of Metzamor, Armavia province, 40° 08.573' N, 44°10.270' E, 18 May 2008.  Description  
Shell ovate-conic with 4–4.5 whorls, height 2.6–3.6 mm (Fig. 8 A–C, Table 2); periostracum yellowish; protoconch approximately 385 µm wide with 1.3 whorls and nucleus around 125 µm long; protoconch microsculpture wrinkled (Fig. 8 D); body whorl about ⅔ total length and bearing two weak spiral keels; rest of whorls tall and convex with a deep suture; aperture complete, pyriform, with an inner lip thicker than outer lip; peristome margin slightly sinuate.  
Operculum with 2.5 whorls approximately (Fig. 8 E–F) and muscle attachment area oval and located near the nucleus.  
Radula intermediate length (25% total shell length) bearing around 45 rows of teeth; central tooth formula 3–C–3/(2)3–3(2) (Fig. 8 G–H); lateral teeth formula 3–C–3; inner and outer marginal teeth bearing 17–21 and 19–25 cusps, respectively (Fig. 8 I).  Pigmentation and anatomy  
Head dark brown pigmented from snout to penial base; pigmentation clearer on neck; tentacles also brown pigmented except on ocular lobes; snout as long as wide, with medial lobation. Ctenidium in middle region of pallial cavity with 18–20 gill filaments; osphradium two to three times longer than wide and opposite middle of ctenidium (Fig. 9 A, Table 3).  
Nervous system with black pigmentation and moderately concentrated (mean RPG ratio 0.45, Table 3); cerebral ganglia equal in size (Fig. 9 B).  
Female genitalia with a capsule gland longer than albumen gland (Fig. 9 C, Table 3); pyriform bursa copulatrix lying against the middle section of the albumen gland; bursal duct longer than bursa length; renal oviduct straight and white from the insertion point of bursal duct to SRII; hereafter black pigmented making one or two loops; two opposite seminal receptacles; SRI pyriform with short duct and SRII smaller, black pigmented, globular and sessile (Fig. 9 D).  
Male genitalia bearing a penis simple, gradually tapering, with a distal end tapered, and black pigmented on the distal section (Fig. 9 E–F); bean-shaped prostate gland about two times longer than wide (Fig. 9 G, Table 3).  Remarks  
 Specimens from the type locality varied in shell dimensions and whorl convexity (Fig. 8 A–C and Shadin 1952: fig. 51), though they were similar in their anatomical features. So far, Shadinia is the only pyrgulinid genus bearing two seminal receptacles (for a morphological review of the Pyrgulinae subfamily see Radoman (1983); the anatomy of Pyrgula Cristofori & Jan, 1832 and Dianella Gude, 1913 is described in Szarowska 2006). Size of seminal receptacles varies slightly between the three anatomically known species, being smaller in S. terpoghassiani than in S. bjniensis. Moreover, some specimens of S. terpoghassiani are larger (shell height S. bjniensis 3.6–4.0 mm, S. terpoghassiani 5.2 mm, see Shadin 1952) and often two weak spiral keels are present in the shell body whorl. Three basal cusps in the central radular tooth are also present in S. akramowskii (Shadin 1952). The species of Shadinia here analyzed differ from each other by 0.4% COI p-distances (Table 4).   Ecology and distribution  
Armenia and Nakhchivan province of Azerbaijan (Akramowski 1976).  
EuropeanJournalofTaxonomy  
208  
:  
1  
–  
29  
(  
2016  
)  
24
description: Published as part of Diana Delicado, ladimir Pešić & Peter Glöer, 2016, Unraveling a new lineage of Hydrobiidae genera (Caenogastropoda: Truncatelloidea) from the Ponto-Caspian region, pp. 1-29 in European Journal of Taxonomy 208 on pages 20-24, DOI: 10.5852/ejt.2016.208, http://zenodo.org/record/269306