Litthabitella aquaadcrucem Jaszczyńska et Osikowski, 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 : 308-309

Litthabitella aquaadcrucem Jaszczyńska et Osikowski sp. nov.

( Figures 3 (a), 4 (m–s), 5 (b,e,h), 7, 8, 9 (b–e), 10)

urn:lsid:zoobank.org:act:2ABE7402-A94B-4289-BD15-E98F5C147B2E

Diagnosis

Shell small, ovate conical, distinguished from similarly high and broad L. chilodia by a proportionally lower aperture and thus higher spire, less weakly angled adapically, and less broad tip of the penis. COI sequences: ON661272–ON661278; H3 sequences: ON661565–ON661570; 18S sequences: ON667998–ON668004. COI MDCs: 12, C; 33, C; 66, A; 93, A; 115, T; 120, G; 159, G; 174, T; 177, T; 222, T; 225, G; 354, C; 363, C; 393, G; 399, G; 402, A; 408, C; 432, G; 453, G.

Etymology

The specific name aquaadcrucem is the Latin phrase ′ aqua ad crucem ̍, which means ′water at the cross̍, and is a translation of the Serbian Voda u Križa, which is the name of the spring. It should be considered a noun in apposition.

Type material

Holotype. MONTENEGRO: ethanol-fixed specimen ( Figure 3 (a)); W of Sotonići, small spring Voda u Križa near the restaurant of the same name; 42.2367°N, 19.0439°E; 183 m a.s.l.; our locality 8 ( Figure 2 (d)), on the gravel; July 2005; Magdalena Szarowska, Andrzej Falniowski; MNHW-1439.

Paratypes. MONTENEGRO: 20 specimens (ethanol-fixed); same collection data as for holotype, DMJU 2211 .

Description

Shell. ( Figure 3 (a)) Ovate conical up to 2.51 mm high, whorls 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 glossy with very slightly marked growth lines, thickwalled and translucent, periostracum whitish. Initial part of the protoconch narrow, on the protoconch surface only delicate irregularities ( Figure 5 (b)).

Measurements of holotype and sequenced and illustrated shells: see Table 4 . Shell variability slightly marked ( Figure 4 (m–s)).

Morphology and anatomy of soft parts. The head with eyes and no pigment; mantle intensively black pigmented. Ctenidium with 19 short lamellae (in five examined specimens), the osphradium broad ( Figure 7 (a)). Radula ( Figure 5 (e,h)) typical of Litthabitella . Anus long forward from the female gonopore ( Figure 7 (a)). Female reproductive organs ( Figure 7 (a–d)) as described above for the family. Penis ( Figure 9 (b–e)) as described above for the family, with less broad tip than in L. chilodia ( Figure 9 (a)).

Distribution and habitat

Known from the type locality (8), the small spring Voda u Križa near the restaurant of the same name ( Figure 2 (d)), and localities 6 and 9 ( Figure 1 and Table 1 ).

Figures

Figure 1. Localities of origin of the sequenced specimens. Numbers correspond to Table 1. Colours correspond to genetic lineages in the phylogram (Figure 10). Insert: palaeogeographic map of the Late Tortonian (8–7 Mya), indicating position of continental, shallow and deep basins (modified from Biltekin 2010); the red arrow points to the study area.

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 7. Female reproductive organs of Litthabitella aquaadcrucem (Sotonići,locality 8): (a) female organs with rectum, anus, ctenidium and osphradium; (b) pallial section of the organs; (c) complex of bursa copulatrix, two receptacles and oviduct; (d) perpendicular sections through the capsule gland. Abbreviations: a, anus; bc, bursa copulatrix; cbc, bursal duct; ct, ctenidium; ga, albumen gland; gn, capsule gland; gp, gonoporus;osp,osphradium;ov, oviduct; rec, rectum;rs1, seminal receptacle close to junction of bursal duct and albumen gland; rs2, seminal receptacle adjoining renal oviduct; vc, ventral channel; vc̍, ventral channel separated with broad folds, imitating spermathecal duct) (after Szarowska 2006).

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.