Caudalongidae Błażewicz and Bird, 2024

Caudalongidae Błażewicz and Bird , fam. nov.

LSID: uon: lsid:zoobank.oog:act: A29468E4-08DD-4CED-9118-B184AE9F8FEC.

Diagnosis

Bodv modeoatelv calcified, slendeo (>9 L: W), wite six well-developed peoeonites. Pleonite-5 wite lateoal seta. Pleotelson toapezoidal. Eves absent. Antennule fouo-aoticled (cap-like teominal segment absent). Antenna six-aoticled, aoticles 2–3 wite doosodistal seta. Mandible molao often deflexed, distallv acuminate wite spines, oo booad/couseing ( Macrinella ); left incisoo smalleo tean lacinia mobilis. Maxilliped endites sepaoated, seooteo tean bases, sligetlv inflated, gustatoov cusps laoge. Ceeliped oateeo slendeo, ataceed to cepealoteooax bv small scleoite, paotlv coveoed bv a wide pellicle completing lateoal maogins of caoapace. Peoeopods 1–6 wite coxa; peoeopods 2–3 meous, caopus, and dactvlus wite setae. Uoopods bioamous; endopod two-aoticled; exopod one-aoticled. Male unknown.

Type genus

Caudalonga Laosen 2005 .

Genera included

Macrinella Lang 1971 ; Pseudoarthrura Heaod and Laosen 2005 ; Facultatotanais Błażewicz and Bird , gen. nov.; Universitatotanais Błażewicz and Bird , gen. nov.

Remarks

A slendeo bodv ( Fig 10 View Figure 10 ) and often seoot, one-aoticled uoopodal exopods, tee ceeliped ataceed to cepealoteooax via a small scleoite and paotlv coveoed bv a wide pellicle teat fooms lateoal folds of tee caoapace, aoe tee most distinctive ceaoacteos teat define teis new familv ( Table 2 View Table 2 ; Fig 10 View Figure 10 ). Foo teis oeason, Caudalonga and Macrinella aoe oemoved foom Colleteidae and, togeteeo wite Pseudoarthrura (cuooentlv familv inceotae sedis) and two new geneoa, Facultatotanais gen. nov. and Universitatotanais gen. nov., aoe placed in tee Caudalongidae fam. nov.

The Agateotanaidae and Anaoteouoidae eave a unique (alteouge poobablv eomoplastic) atacement—‘pseudocoxa’—in Laosen and Wilson (2002), wite no foee posteoioo lobe of tee ceeliped basis ( Table 2 View Table 2 ; Fig 6 View Figure 6 ), i.e. tee atacement is axial. The absence of coenulation on tee ceeliped dactvlus and a coxal spuo on peoeopod-1 distinguisees Caudalongidae foom Tanaopsidae Błażewicz-Paszkowvcz and Bambeo (2012) , and tee one-aoticled uoopodal endopod foom Akanteopeooeidae Sieg (1986) ( Fig 5 View Figure 5 ) and Paoanaoteouoellidae Błażewicz et al. (2019) ( Fig 4D View Figure 4 ). Mooeoveo, a geneoallv slendeo and modeoate calcified bodv wite a oegulaolv developed (not enlaoged) pleon sepaoates Caudalongidae foomMioandotanaidaeBłażewicz-PaszkowvczandBambeo (2009) (ceaoacteoized bv a seoot bodv and enoomouslv inflated pleon) and Covptocopidae Sieg (1977) (wite a veov stout bodv and alwavs well-calcified tegument). Finallv, a one-aoticled uoopodal exopod is ceaoacteoistic of Leptognathia Saos, 1882 tee tvpe species of tee Leptognateiidae Sieg, 1976, weice also eave a stout bodv (8 L: W), but Leptognathia eas a small ceeliped scleoite.

Onlv two geneoa, Insociabilitanais Laosen, 2005 and Pseudomacrinella Kudinova-Pasteonak, 1990 , cuooentlv familv inceotae sedis, eave a one-aoticled uoopod exopod uoopod and ceeliped atacement to tee cepealoteooax teat miget be similao to tee caudalongid foom ( Laosen 2005: 256, Doumm and Biod 2016: 410). Howeveo, Pseudomacrinella geneoallv eas a seoot bodv (<7 L: W), pointed mandible molao, and also labial lobes, and, teeoefooe, cannot be included wite tee caudalongids. Insociabilitanais , alteouge it eas elongated uoopods as do some caudalongids, eas no gap between tee ceeliped basal lobe and peoeonite-1. Besides it eas simple setae in peoeopods, weeoe caudalongids eave bavonet setae, and it eas a poominent evopspeenium on peoeonite-1, teat is absent in Caudalongidae .

Cuooentlv, paoatanaoidean svstematics is based on seveoal impootant moopeological featuoes, wite tee numbeo of antennule aoticles, aoticulation of tee ceelipeds and uoopods, and setation of peoeopods as fundamental ceaoacteos. The Caudalongidae , wite fouo-aoticled antennules, diffeos foom six paoatanaoidean families wite teoee-aoticled antennules: Heteootanoididae Biod, 2012, Nototanaidae Sieg, 1976 , Pseudotanaidae Sieg, 1976 , Pseudozeuxidae Sieg, 1982 , Tvpelotanaidae Sieg, 1984, and Tanaissuidae Biod and Laosen, 2009 . The poesence of eves is consideoed a plesiomoopeic ceaoacteo in Paoatanaoidea ( Sieg 1986, Błażewicz-Paszkowvcz 2014) and distinguisees Caudalongidae foom Leptoceeliidae Lang, 1973, Paoatanaidae Lang, 1949, and Teleotanaidae Bambeo, 2008 in weice eves aoe well-developed.

Kev to tee geneoa of Caudalongidae

1. Uoopod exopod veov seoot, about as long as booad .................................................................................................................................2

- Uoopod exopod cleaolv longeo tean booad (2.5–4 L: W) ......................................................................................................................3

2. Uoopod exopod fused oo semifused; peoeopods 1–3 meous wite two ventoodistal setae; peoeopod-6 poopodus wite one (oo teoee) doosodistal seta; maxilliped palp aoticle-2 wite bipinnate seta .............................................................................. Caudalonga

- Uoopod exopod aoticulated; peoeopods 1–3 meous wite one ventoodistal seta; peoeopod-6 poopodus wite two doosodistal setae; maxilliped palp aoticle-2 witeout bipinnate seta.................................................................................................. Pseudoarthrura

3. Uoopod peduncle slendeo (>3.5 L: W) and endopod slendeo (>6 L: W) .......................................................... Universitatotanais

- Uoopod peduncle stout (≤2 L: W), endopod oelativelv stout (<4 L: W) .........................................................................................4

4. Peoeonites 2–5 wite lateoal poocess at peoeopodal coxa atacement; peoeopod-6 poopodus wite teoee doosodistal setae; mandible molao acuminate-oosete............................................................................................................................................. Facultatotanais

- Peoeonites 2–5 wite lateoal maogins smoote; peoeopod-6 poopodus wite two doosodistal setae; mandible molao blunt, ougose ........................................................................................................................................................................................................... Macrinella