Lepechinellidae Schellenberg, 1926

Johansen, Per-Otto & Vader, Wim, 2015, New and little known species of Lepechinella (Crustacea, Amphipoda, Lepechinellidae) and an allied new genus Lepesubchela from the North Atlantic, European Journal of Taxonomy 127, pp. 1-35 : 3-4

Family Lepechinellidae Schellenberg, 1926

The amphipod Lepechinella chrysotheras , described by Stebbing (1908), was initially placed in the family Paramphithoidae Stebbing, 1906 . Unaware of this, Chevreux (1914) described Dorbanella echinata and placed it in the family Tironidae Stebbing, 1906 . Schellenberg (1925) described Dorbanella sp. and the family Dorbanellidae . One year later Schellenberg (1926) became aware of the earlier description of a Lepechinella species by Stebbing, and established the family name Lepechinellidae . Later J.L. Barnard (1973) transferred the genera Lepechinella and Paralepechinella Pirlot, 1933 to the family Dexaminidae Leach, 1814 . Barnard & Karaman (1991) included Lepechinella Stebbing, 1908 , Lepechinellopsis Ledoyer, 1982 , Lepechinelloides Thurston, 1980 and Paralepechinella Pirlot, 1933 in the family Dexaminidae . Andres & Brandt (2001) revalidated the status of family Lepechinellidae . Sittrop & Serejo (2009) gave a more extensive historical review of lepechinellid systematics.

Diagnosis

Andres & Brandt’s diagnosis of Lepechinellidae from 2001 is based on the publications of Schellenberg (1926), J.L. Barnard (1970, 1973) and Bousfield & Kendall (1994): “Diagnosis: Body processiferous

dorsomedially (variable), and/or covered with setae/spines. One to all coxal plates of peraeopods 1–4

acutely pointed distally, sometimes bifid. Ursomites 2 and 3 separate to completely fused. Accessory flagellum one- or two-articulate. Mandibular molar and palp present. Lower lip with inner lobes. Maxilla 2: inner plate without oblique row of setae. Peraeopods slender, elongate; peraeopods 5–7 similar, bases linear. Oostegites narrow. Rami of uropods styloid; uropod 3 outer ramus with tiny article 2. Telson normally excavate, lobes usually gaping widely.”

Variations

Rostrum present (e.g., Lepechinella ) or lacking (e.g., Lepechinelloides ); cephalic teeth present (e.g., Lepechinella ) or lacking ( Lepechinelloides , Paralepechinella ); urosome segments 2 and 3 separate ( Lepechinella wolffi ) to completely fused (e.g., Lepechinella echinata , L. drygalskii and L. curvispina, Paralepichinella spp.); mandibular molar triturative ( Lepechinella , Paralepechinella ) or non-triturative ( Lepechinelloides , Lepechinellopsis ); mandibular palp three-articulate ( Lepechinella , Lepechinellopsis , Paralepechinella ) or one-articulate ( Lepechinelloides ); uropods 1–3 outer rami reduced ( Lepechinellopsis ); telson cleft distally ( Paralepechinella longipalpa Pirlot, 1933 ).

Type genus

Lepechinella Stebbing, 1908

The genera included in Lepechinellidae are: Lepechinella Stebbing, 1908 ; Paralepechinella Pirlot, 1933 ; Lepechinelloides Thurston, 1980a ; Lepechinellopsis Ledoyer, 1982 . This paper also includes a new genus called Lepesubchela gen. nov. The type species of this genus is among others characterized by strongly subchelate peraeopods 6 and 7.

Key to the genera of Lepechinellidae

1. Mandible palp 1-articulate ………………………………………… Lepechinelloides Thurston, 1980

– Mandible palp 3-articulate …………………………………………………………………………2

2. Peraeopods 6 and 7 clearly subchelate …………………………………… Lepesubchela (gen. nov.)

– Peraeopods 6 and 7 simple …………………………………………………………………………3

3. Mandible palp with article 3 extremely long, longer than 10x article 2 … Paralepechinella Pirlot, 1933

– Mandible palp with article 3 normal, shorter than article 2 …………………………………………4

4. Uropods 1–3 with outer ramus strongly reduced, shorter than 1/3 of inner ramus ………………… ……………………………………………………………………… Lepechinellopsis Ledoyer, 1982

– Uropods 1–3 with outer ramus normal ………………………………… Lepechinella Stebbing, 1908