Table 1 Presence and number of anterior (AC) and posterior midut caeca (PC) in different crustacean taxa. In some taxa the midgut gland resembles to a caeca-like organ, such caeca are not included in this table

Gammarus lacustris G.O. Sars, 1863

Amphipoda

1

2

[52]

Hyalella azteca Saussure, 1858

Amphipoda

3

2

[53]

Macarorchestia remyi (Schellenberg, 1950)

Amphipoda

3

2

[54]

Galathea squamifera Leach, 1815

Anomura

0

0

[31]

Lithodes maja (Linnaeus, 1758)

Anomura

2

1

[31]

Pagurus bernhardus (Linnaeus, 1758)

Anomura

2

1

[55]

Paralithodes camtschaticus (Tilesius, 1815)

Anomura

2

1

[32]

Homarus gammarus (Linnaeus, 1758)

Astacidea

1

1

[56]

Nephrops norvegicus (Linnaeus, 1758)

Astacidea

1

1

[31]

Axius stirhynchus Leach, 1815

Axiidea

0

1

[57]

Callianassa subterranea (Montagu, 1808)

Axiidea

0

1

[57]

Calocaris macandreae Bell, 1853

Axiidea

0

1

[57]

Cancer pagurus Linnaeus, 1758

Brachyura

2

1

[31]

Carcinus maenas (Linnaeus, 1758)

Brachyura

2

1

[31]

Hyas araneus (Linnaeus, 1758)

Brachyura

2

1

[31]

Liocarcinus depurator (Linnaeus, 1758)

Brachyura

2

1

[31]

Maja brachydactyla Balss, 1922

Brachyura

2

1

Present study

Menippe rumphii (Fabricius, 1798)

Brachyura

2

1

[58]

Metacarcinus magister Dana, 1852

Brachyura

2

1

[59]

Oziothelphusa senex (Fabricius, 1798)

Brachyura

2

1

[31]

Parathelphusa convexa De Man, 1879

Brachyura

2

1

[31]

Portunus sanguinolentus (Herbst, 1783)

Brachyura

2

1

[60]

Scylla serrata (Forskål, 1775)

Brachyura

2

1

[15]

Spiralothelphusa hydrodroma (Herbst, 1794)

Brachyura

2

1

[12]

Crangon crangon (Linnaeus, 1758)

Caridea

0

0

[31]

Neocaridina davidi (Bouvier, 1904)

Caridea

0

0

[61]

Palaemonetes argentinus Nobili, 1901

Caridea

0

0

[62]

Penaeus bennettae R. & D., 1965

Dendrobranchiata

2

1

[63]

Penaeus setiferus (Linnaeus, 1767)

Dendrobranchiata

1

1

[64]

Penaeus vannamei (Boone, 1931)

Dendrobranchiata

1

1

[65]

Jaxea nocturna Nardo, 1847

Gebiidea

0

1

[57]

Upogebia pusilla (Petagna, 1792)

Gebiidea

0

1

[57]

Armadillidium arnasus Budde-Lund, 1885

Isopoda

0

0

[66]

Armadillidium vulgare (Latreille, 1804)

Isopoda

0

0

[66]