(075/ADsub) Anuridella submarina (Bagnall, 1934)

*germanica Gisin, 1951

Anuridella submarina (maximum length 1.1 mm) is an intertidal species which has only been recorded by Bagnall. He described it in 1934 from material collected in June 1934 from Whitburn, Durham. Lawrence & Goto (1968) considered that Anuridella submarina was a junior synonym of Anuridella calcarata Denis 1925. However having examined Bagnall's material in the NHML, Steven agreed with the conclusion of Fjellberg (1998) that Anuridella submarina is a good species. The post-antennal organ (PAO) is elliptical with 15 to 20 vesicles, often different on opposite sides of the head of the same specimen (Figs. 1, 2). Also, the pair of setae a1 on the dorsal side of abd6 are ABSENT (Fjellberg 1998); this character is easy to observe on most specimens (Fig. 3). Coxal lobes are present only on legs3 but they are quite difficult to resolve on mounted specimens (Fig. 4). Anuridella immsiana and Anuridella submarina (and Anuridella calcarata) have hammer-shaped sensillae on ant4 (Fig. 5); all ant4 sensilla are finger-like in Anuridella marina.

 

 

 

Map Anuridella submarina
Post-antennal organ (PAO) on the left side of the head of Anuridella submarina

Fig. 1: Post-antennal organ (PAO) on the left side of the head of Anuridella submarina collected from Whitburn, Durham in June 1939 by R.S. Bagnall. There are 19 lobes.

PAO on the right side of Anuridella submarina

Fig. 2: PAO on the right side of the same specimen as that shown in Fig. 2. There are only 15 lobes.

Chaetotaxy on the dorsal side of the sixth abdominal segment of Anuridella submarina

Fig. 3 (above): Chaetotaxy on the dorsal side of the sixth abdominal segment (abd6) of Anuridella submarina collected from Whitburn, Durham in June 1939 by R.S. Bagnall. The a1 setae are ABSENT (*).

Coxal lobe (*) adjacent to the third leg (leg3) of Anuridella submarina

Fig. 4: Coxal lobe (*) adjacent to the third leg (leg3) of Anuridella submarina collected from Whitburn, Durham in June 1939 by R.S. Bagnall.

Hammer-like sensilla on the tip of the fourth antennal segment (ant4) of Anuridella submarina

Fig. 5: Hammer-like sensilla on the tip of the fourth antennal segment (ant4) of Anuridella submarina collected from Whitburn, Durham in June 1939 by R.S. Bagnall.

Apical parts of the mandibles (man) and maxillae (max) of Anuridella submarina

Fig. 6: Apical parts of the mandibles (man) and maxillae (max) of the same specimen of Anuridella submarina shown in Fig. 1.

 
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