Litthabitella cetinensis Osikowski et Jaszczyńska, 2023

Falniowski, Andrzej, Jaszczyńska, Aleksandra, Osikowski, Artur & Hofman, Sebastian, 2023, Litthabitellidae: a new family of the Truncatelloidea (Mollusca: Caenogastropoda), Journal of Natural History 57 (5 - 8), pp. 299-329 : 309-311

Litthabitella cetinensis Osikowski et Jaszczyńska sp. nov.

( Figures 3 (b), 4 (t–v), 5 (c,f,i), 9(f))

urn:lsid:zoobank.org:act:10089647-36C6-4773-8E7F-AA0D5BB02833

Diagnosis

Shell small, ovate conical, distinguished from L. chilodia and L. aquaadcrucem by smaller and less thick-walled shell and penis with less broad tip and longer and broader filament. COI sequences: ON661294–ON661297; H3 sequences: KY215954–KY215958; 18S sequences: ON668020–ON668023. COI MDCs: 6, A; 21, G; 39, A; 51, C; 84, G; 90, C; 111, A; 132, G; 135, A; 144, T; 153, C; 171, G; 174, C; 183, G; 219, G; 276, C; 309, C; 369, G; 399, T; 402, C; 436, C; 438, A.

Etymology

The specific name cetinensis reflects the geographic localisation of the type locality within the valley of Cetina River.

Type material

Holotype. CROATIA: ethanol-fixed specimen ( Figure 3 (b)); Kostanje , a medium-sized spring at the right bank of the Cetina River; 43.4411°N, 16.8228°E, 133 m asl; our locality 1 ( Figure 2 (a)); June 2011; leg. Magdalena Szarowska, Andrzej Falniowski; MNHW-1440.

Paratypes. CROATIA • 10 specs (ethanol-fixed); same collection data as for holotype, DMJU 2212 .

Description

Shell ( Figure 3 (b)) ovate conical up to 2.02 mm tall, growing regularly. Holotype measurements: see Table 4 . Teleoconch whorls slightly convex, evenly rounded. Aperture narrow, ovate, weakly angled adapically, peristome continuous, in its upper part fitting tight to body whorl. Parietal lip complete, adnate, umbilicus nearly completely covered by lip. Outer lip fluted, orthocline. Shell white and glossy with very slightly marked growth lines, moderately thick-walled and translucent, periostracum white. Initial part of the protoconch narrow, on the protoconch surface only delicate irregularities ( Figure 5 (c)).

Measurements of holotype and sequenced and illustrated shells: see Table 4 . Shell variability slight ( Figure 4 (t–v)).

Morphology and anatomy of soft parts. The head with eyes and no pigment; mantle pigmented less intensively than in the other Litthabitella . Ctenidium with 14 short lamellae, the osphradium broad. Radula ( Figure 5 (f,i)) typical of Litthabitella . Penis ( Figure 9 (f)) with rather narrow tip and longer and broader filament than in the other Litthabitella species.

Distribution and habitat

Known from the type locality only: Kostanje, a medium-sized spring at the right bank of the Cetina River ( Figure 2 (a)).

Figures

Figure 2. Some of the studied localities: (a) Kostanje (locality 1); (b) Trsteno (locality 5); (c) Tomići (locality 7); (d) Sotonići, spring Voda u Križan (locality 8); (e,f) Levkas Island (locality 10).

Figure 3. Holotypes of Litthabitella: (a) L. aquaadcrucem; (b) L. cetinensis; (c) L. levkadensis. Scale bar: 1 mm.

Figure 4. Shells of Litthabitella. (a–l) L. chilodia: (a–d) locality 3, (e–j) locality 5, (k,l) – locality 2; (m–s) L. aquaadcrucem: (m–q) locality 6, (r) locality 8, (s) locality 9; (t–v) L. cetinensis, locality 1. Sequence numbers: a, 2G39; b, 2G40; c, 2G43; d, 2G45; e, 2G4; f, 2G1; g, 2G3; h, 2G2; i, 2F99; j, 2F100; k, 2D3; l, 2D5; m, 1T10; n, 1T11; o, 1T12; p, 2G15; q, 2G16; r, 8F3; s, 1M25; t, 8G1; u, 8G2; v, 6D8. Scale bar: 1 mm.

Figure 5. Protoconchs and radulae of Litthabitella. (a–c) Protoconchs: (a) L. chilodia, locality 5; (b) L. aquaadcrucem, locality 6; (c) L. cetinensis, locality 1; (d–i) radulae: (d,g) L. chilodia, locality 5; (e,h) L. aquaadcrucem, locality 6; (f,i) L. cetinensis, locality 1. Scale bars: a–c = 400 μm; d–f = 30 μm; g–i = 10 μm.

Figure 9. Penes of Litthabitella: (a) L. chilodia, Trsteno, locality 5, scale bar: 500 μm; (b–e) L. aquaadcrucem: (b–d) Sotonići, locality 8; (e) Budva, locality 6; (f) L. cetinensis, Kostanje, locality 1; (b, d,e) bent, in relaxed habitus. Arrows: glandular swellings.